Q: I replaced spark plugs on 2003 Ford Escape 3.0 L and pulled air intake plenum to reach plugs in back of engine. Replaced the gaske

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I replaced the spark plugs and since I needed to reach plugs in back i pulled the air intake plenum. When I reassembled the car and test drove it. I now have codes P02195, P02197, P0303, P0316. When I reassembled I went ahead and replaced the gaskets on the intake plenum. I was not getting any codes before replacing the plugs. I just decided to go over the car so my daughter could drive it to school.

My car has 125000 miles.
My car has an automatic transmission.

Based on the codes you are reporting, a possibility is an air intake (vacuum) leak on the plenum. To get indirect confirmation of that, you can apply a real time scanner and look at fuel trims. If fuel trims are high (positive), air is leaking in and to compensate for that fuel is being added to keep the A/F ratio in the desired, target range. A first suggestion would be to re-visit the work you did and rule out a leak as a cause. If you desire, a certified mechanic can re-check the work and resolve this. The service to request would be a check engine light diagnostic. Be sure to let the mechanic know that you removed the plenum. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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